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<p><i>Crocus sativus</i> L. is propagated through corms, relies on corm fresh weight for yield and quality. Beneficial microbes offer a sustainable alternative to chemical fertilizers. This study isolated ten rhizospheric fungi from <i>C. sativus</i> rhizosphere soil, identifying their plant growth-promoting traits: all produced indole-3-acetic acid (IAA) and gibberellic acid (GA), seven degraded 1-aminocyclopropane-1-carboxylate (ACC), nine synthesized siderophores, and one solubilized phosphate. As indicated by the findings from the field trials, it was observed that SR07 (<i>Clonostachys</i> sp.), SR09 (<i>Fusarium</i> sp.), SR15 (<i>Fusarium</i> sp.), SR22 (<i>Cadophora</i> sp.), SR24 (<i>Aspergillus</i> sp.), SR75 (<i>Plectosphaerella</i> sp.) and SR89 (<i>Fusarium</i> sp.) had a positive impact on the fresh weight of <i>C. sativus</i> corms. Additionally, a reduction in the malondialdehyde content was observed, accompanied by an elevation in the antioxidant enzyme system in corms treated with SR07 and SR09. Further research indicates that SR07 and SR09 cause an increase in the total bacterial and fungi count, resulting in elevated levels of microbial biomass carbon and nitrogen in rhizosphere soil, and the levels of soil sucrase, urease, dehydrogenase, catalase, acid phosphatase activities and alkaline phosphatase activities were also increased. The study further explores how plant growth-promoting fungi regulate gene expression to promote the accumulation of crocin and picrocrocin in <i>C. sativus</i>. Finally, the correlation analysis showed that the positive effects caused by beneficial rhizospheric fungi were important for the increase of corms production.</p>

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Isolation of Rhizospheric Fungi from Crocus sativus L. Rhizosphere and their Effects on Host-Growth Promotion

  • 期刊论文

  • 发表日期：

    2026年4月4日

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  • Jing-Chao Xu,
  • Xing-Guang Xie,
  • Xin-Zhu Yu,
  • Zi-hao Zhu,
  • Xue-Wen Bi,
  • Kun-miao Feng,
  • Ying-jie Lu,
  • Khalid Rahman,
  • Bo Zhu,
  • Lu-ping Qin,
  • Zhen-zhen Zhang,
  • Ting Han

摘要

Crocus sativus L. is propagated through corms, relies on corm fresh weight for yield and quality. Beneficial microbes offer a sustainable alternative to chemical fertilizers. This study isolated ten rhizospheric fungi from C. sativus rhizosphere soil, identifying their plant growth-promoting traits: all produced indole-3-acetic acid (IAA) and gibberellic acid (GA), seven degraded 1-aminocyclopropane-1-carboxylate (ACC), nine synthesized siderophores, and one solubilized phosphate. As indicated by the findings from the field trials, it was observed that SR07 (Clonostachys sp.), SR09 (Fusarium sp.), SR15 (Fusarium sp.), SR22 (Cadophora sp.), SR24 (Aspergillus sp.), SR75 (Plectosphaerella sp.) and SR89 (Fusarium sp.) had a positive impact on the fresh weight of C. sativus corms. Additionally, a reduction in the malondialdehyde content was observed, accompanied by an elevation in the antioxidant enzyme system in corms treated with SR07 and SR09. Further research indicates that SR07 and SR09 cause an increase in the total bacterial and fungi count, resulting in elevated levels of microbial biomass carbon and nitrogen in rhizosphere soil, and the levels of soil sucrase, urease, dehydrogenase, catalase, acid phosphatase activities and alkaline phosphatase activities were also increased. The study further explores how plant growth-promoting fungi regulate gene expression to promote the accumulation of crocin and picrocrocin in C. sativus. Finally, the correlation analysis showed that the positive effects caused by beneficial rhizospheric fungi were important for the increase of corms production.